React Native

Get RSA Public Key in JWK Format (JSON Web Key)

See more JSON Web Signatures (JWS) Examples

Demonstrates how to get an RSA public key in JWK (JSON Web Key) format.

Note: This example requires Chilkat v9.5.0.66 or later.

React Native

import { JsonObject, PublicKey, StringBuilder } from '@chilkat/react-native'

function chilkatExample() {
  // Note: This example requires Chilkat v9.5.0.66 or later.

  // Load a PEM file into memory.
  const sbPem = new StringBuilder();
  try {
    sbPem.loadFile('qa_data/pem/rsa_public.pem', 'utf-8');
  } catch {
    console.log('Failed to load PEM file.');
    return;
  }

  // Load the PEM into a public key object.
  const pubKey = new PublicKey();
  try {
    pubKey.loadFromString(sbPem.getAsString());
  } catch {
    console.log(pubKey.lastErrorText);
    return;
  }

  // Get the public key in JWK format:
  const jwk = pubKey.getJwk();

  // The GetJwk method will return the JWK in the most compact JSON format possible,
  // as a single line with no extra whitespace.  To get a more human-readable JWK (for this example),
  // load into a Chilkat JSON object and emit non-compact:

  const json = new JsonObject();
  json.load(jwk);
  json.emitCompact = false;
  console.log('RSA Public Key in JWK format:');
  console.log(json.emit());

  // Sample output:
  // { 
  //   "kty": "RSA",
  //   "n": "33TqqLR3eeUmDtHS89qF3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA04DDnEFGAf-kDQiNSe2ZtqC7bnIc8-KSG_qOGQIVaay4Ucr6ovDkykO5Hxn7OU7sJp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwFwnxCsU5-UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUEf0YN3_Q0auBkdbDR_ES2PbgKTJdkjc_rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1WSw",
  //   "e": "AQAB"
  // }

  // Additional information can be added like this:
  json.appendString('use', 'enc');
  json.appendString('kid', '123ABC');

  // Now examine the JSON:
  console.log(json.emit());

  // { 
  //   "kty": "RSA",
  //   "n": "33TqqLR3eeUmDtHS89qF3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA04DDnEFGAf-kDQiNSe2ZtqC7bnIc8-KSG_qOGQIVaay4Ucr6ovDkykO5Hxn7OU7sJp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwFwnxCsU5-UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUEf0YN3_Q0auBkdbDR_ES2PbgKTJdkjc_rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1WSw",
  //   "e": "AQAB",
  //   "use": "enc",
  //   "kid": "123ABC"
  // }
}